Finding the Third Proportional to 3,949.50 and 9,142.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,949.50 : 9,142.88 = 9,142.88 : x
2. Step 2: Convert to fraction form
   3,949.50/9,142.88 = 9,142.88/x
3. Step 3: Cross multiply
   3,949.50x = 9,142.88 × 9,142.88
4. Step 4: Simplify right side
   3,949.50x = 83,592,163.27
5. Step 5: Solve for x
   x = 83,592,163.27/3,949.50
6. Step 6: Final answer
   x = 21,165.25